The binder is large capacity and the D ring opens very easily. As the title says it is sturdy and of commercial grade. I just received it so I cannot comment as to the wear and tear than it can withstand.
For years I have been using this style of binder and wouldn't use anything different. The colors to chose from are more than adequate and the quality is top notch. Strongly recommend this product to anyone.
I purchased this binder for my wife who teaches health. The large size allows her to keep several lessons together. This binder is very durable. I know this because she purchased one over four years ago and she told me it is like new—this September will be her 5th school year using this brand of binder. Thank you for a great product.